Returns an array of UIDs from uids
that are not in cache,
and
removes UIDs from cache
that aren't in uids
.
an array of UIDs
Attempts to save cache
back to disk.
Marks a uid for saving.
a uid to save
Frees the array of UIDs.
an array returned from camel_uid_cache_get_new_uids()
Destroys
cache
and frees its data.